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Create UID with GID as root. This UID created will be having permission
same as the root.
Also there are different tools which can be installed on Solaris 9 which
will help you to have root like permission

Edit /etc/passwd file. Pick an account and change the UID to 0 and the GID
to 1 and that user will now be the same as root.
Maybe you will also want to change the home directory to "/". Now this user
is root. This is how you can have a second root account, with a different
password.